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Samething is happening to my truck.. Ford dealer told me it is the fuel pump.. Plugs new filter all the above have ... been done. i will be doing the FP very shortly.. ford wants 700 for part and labor... i think i'll do it meself.. there is a check valve in the pump that does not build up enough pressure.
Mark
I had the same thing happen to a 2003 Expedition. Like Mark said above it turned out to be the fuel pump. It is suppose to keep positive pressure in the line so you have fuel at the engine when you start the vehicle. My fuel pump was not maintaining that pressure causing the fuel to drain back into the tank. New fuel pump installed and it cranks everytime now.